Process for reducing the 4-carboxybenzaldehyde content of a crud

Details Process for reducing the 4-carboxybenzaldehyde content of a crud Process for reducing the 4-carboxybenzaldehyde content of a crud

1986-02-03

1987-06-02

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562486, C07C 5142

Patent

active

046705872

ABSTRACT:
This invention relates to a process for the purification of crude terephtic acid. The process includes heating the crude acid on a first plate and locating a second plate adjacent the first plate whereby vapors emanating from the crude acid form a sublimate on the second plate. The principal impurity removed is 4-carboxybenzaldehyde. The crude acid produced is applied to the first plate as a layer having a thickness of about 2 to about 5 mms thick and heated to a temperature of from about 180.degree. to about 220.degree. C. The upper plate is not heated except by the convective heat transfer and the heat of sublimation provided by the vapor moving from the crude acid layer to the second plate.

REFERENCES:
patent: 3330863 (1967-07-01), Read et al.
patent: 3362989 (1968-01-01), McMakin et al.
patent: 3526658 (1970-09-01), Bryant
patent: 3658894 (1972-04-01), Joveland et al.

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